Patch to sync with some changes to mod_dav 1.1:

*) revamp the set_target stuff -- latest draft calls this UPDATE
*) update the CHECKIN method handling
*) liveprop providers can catch/define "core" properties before the core
   gets a chance.

Submitted by: John Vasta <jvasta@rational.com>
Reviewed by: Greg Stein


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@88599 13f79535-47bb-0310-9956-ffa450edef68